The Siemens Optiset E PNT Adaptor (Part Number S30807-U5372) is available from Office Phone Shop fully tested and with a warranty.
Office Phone Shop can supply a wide range of Siemens phones, parts and spares.
Office Phone Shop stock a complete range of Siemens Optiset E phone accessories including:
Optiset E Analog Adaptor & PSU
Optiset E Headset Plus Adaptor